Section: Thermodynamics | Type: NAT | Marks: 2
Moist air having 60% relative humidity, enters a steady-flow air-conditioning unit at 102 kPa and 30 °C. The volume flow rate of the moist air entering the unit is 0.1 m3/s. The moist air leaves the unit at 95 kPa and 15 °C with a relative humidity of 100%. Liquid condensate leaves the unit at 15 °C. For water: at 15 °C, ℎ𝑓 = 62.982 kJ/kg, ℎ𝑔 = 2528.3 kJ/kg, 𝑃𝑠𝑎𝑡 = 1.7057 kPa. at 30 °C, ℎ𝑓 = 125.74 kJ/kg, ℎ𝑔 = 2555.6 kJ/kg, 𝑃𝑠𝑎𝑡 = 4.2469 kPa. For air, specific heat at constant pressure is 1.004 kJ/kg.K and the specific gas constant is 0.287 kJ/kg.K. Neglecting heat leakage to the surrounding, the magnitude of heat extracted (in kW) from the air stream (up to 2 decimal places) is __________.
Answer: 3.01 to 3.07